초록 ▼

A method of improving the properties of a reverse osmosis membrane having a polyamide discriminating layer containing residual aromatic primary amine groups is described. In this method, the polyamide discriminating layer of the membrane is treated with an aqueous solution of a reagent which reacts

A method of improving the properties of a reverse osmosis membrane having a polyamide discriminating layer containing residual aromatic primary amine groups is described. In this method, the polyamide discriminating layer of the membrane is treated with an aqueous solution of a reagent which reacts with primary amine groups to form diazonium salt groups or derivatives of diazonium salt groups. This method results in a membrane possessing improved chlorine resistance. When nitrous acid is employed as the reagent in the treatment, the water flux of the polyamide membrane is frequently increased with little or no effect on the salt rejection of the membrane.

대표청구항 ▼

A method of improving the properties of a reverse osmosis membrane having a polyamide discriminating layer containing a plurality of residual aromatic primary amine groups, comprising treating the polyamide discriminating layer with an aqueous solution of a reagent which reacts with primary amine gr

A method of improving the properties of a reverse osmosis membrane having a polyamide discriminating layer containing a plurality of residual aromatic primary amine groups, comprising treating the polyamide discriminating layer with an aqueous solution of a reagent which reacts with primary amine groups to form diazonium salt groups or derivatives of diazonium salt groups.